Improvement in bolt-heading machines



UNITED STATES PATENT OEEICE.

JAMES MINTER, OF LOWELL, MASSACHUSETTS.

IMPROVEMENT IN BOLT-HEADING MACHINES.

Specification forming part of Letters Patent No. 56,2117. dated July 10, 1866.

To all whom it may concern.-

Be it known that I, J AMES MINTER, of Lowell, in the county of Middlesex, State of Massachusetts, have invented certain new and useful Improvements in Bolt-Heading Machines 5 and I do hereby declare the following to be a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My invention relates to that class of boltheading machines which use a positive motion for upsetting the metal to form the head, the object of it being` to allow the machine to partially upset the head at the first stroke, and to fully do so afterward at the will of the operator.

To these ends its nature consists in making the connection between the driving dog or power and the carrier or slide holding the heading-die with a notched or variable surface, so arranged that the operator, by using the various parts of said surface, may upset the head gradually, or, when wished, do it at once in the usual Way.

In the drawings, Figure l shows aside view of my invention as applied to a bolt-heading machine patented by me July l2, A. D. 1864c 5 and Fig. 2 shows the adjacent parts of a section through the line of Fig. l.

rEhe same letters indicate the same parts in each.

A is the driving-shaft, with its crank B, and running in boxes in frame O. D is the dog or driver connected to the crank B, its lower end connected by a link to the upper end of the elbow-lever E, which turns on a stud, and has its horizontal arm, connected by the rod F to the treadle, moved by the operator. G is a spring which raises the rod F and that end of the elbowdever E, throwing the other off and holding the lower end of the driver D in the position shown in Fig. 2. H is the carrier or slide holding the heading-die and sliding in suitable ways in frame C, and also provided with two or more notches, a c a, presenting surfaces for the end ofthe driver D to catch upon andoperate it. J is a spring which raises the slide H when not operated. I

The other parts of the machine (not described) may be of most any of the various forms, with such slight variations as allow the application of my invention.

In operation, after Vputting the heated metal in place, the operator, by pressing down the treadle, sets the dies in motion. The driver D, catching first on the surface n, drives the heading-die part way down, upsetting the metal partially, and on the return of the driver to its upper position the operater, by pressing the foot-lever farther down, throws the driver D onto o or o. when ready to finish the head, thus heading or upsetting the metal at two or more blows, while it allows the work to be done at once, if wished, by throwing the driver onto a at thetirst stroke.

It is evident that my invention may be applied in various forms, as the surfaces may be made on the driver, as shown in red ink in Fig. 2, and the slide have only one surface for them to act on, and others will readily suggest themselves in applying it to the various machines, and therefore it is not deemed necessary to describe them minutely here, the above being deemed sufficient to enable any one skilled in the art to construct and use my invention without furtherinvention or experiment.

What I claim as new, and desire to secure by Letters Patent, is-

rIhe notches a n on the carrier H, operating in conjunction with the driver D, or their equivalents, whereby the saine end is accomplished, substantially as above set forth and described.

JAMES MIN'IER. Witnesses;

GEO. P. BAXTER, J AMES G. ARNOLD. 

